Hi
They changed the includes so make sure you include the right ones.
Also they renamed UnicodeUTF8. But hard to guess at without code context where error comes.
if using old project, make sure to delete ANY left over ui_xxx files

If you have a C++11 compiler Q_NULLPTR will be nullptr, else it will be the old C/C++ NULL.
You can use Q_NULLPTR if you have to support older C++ compilers which do not know anything about nullptr and newer C++ compilers.